This contains some actual footage of the visual distortion caused by the black hole at the center of our galaxy.
https://www.hulu.com/watch/110849/spacerip-best-evidence-to-date-that-black-holes-exist#s-p1-sr-i0
https://www.hulu.com/watch/110849/spacerip-best-evidence-to-date-that-black-holes-exist#s-p1-sr-i0